Lesson Plan

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How Structure Can Affect Properties Through Phase Changes

Structure-Property Relationships

Lesson Summary

Overview

Middle school students will discuss how changing the structure of atoms and molecules can change the properties of a substance after watching videos and filling out worksheets. Students can brainstorm and review their own examples of phase change with the help of a phase change diagram. The idea of technology that can change the structure of materials will be introduced. An extension activity on buckyballs is available.

Content Objectives

Students will know that

molecular arrangement determines physical characteristics

phases are physical properties

why changing the structure of the molecule changes the properties of a substance

Process Objectives

Students will be able to

describe the molecular arrangement of various substances

explain the structural changes occurred by a water molecule during phase changes

Part III: Changes in structure other than phase changes (5 minutes)

9. Explain that structure changes are caused by phase changes. We can also change the structure using new technology.

Part IV: Extension

10. Have students explore Buckyballs. This is another structural change of carbon. Students can explore how the atoms were rearranged and what different properties are exhibited. Students can also explore the difference between crystalline structures, where atoms are arranged in a set pattern, and amorphous structures, where atoms are not arranged in set patterns. Have students compare and contrast the properties of crystals like quart, salt, and diamonds, with the properties of amorphous solids like glass and silly putty. How does the structure affect the properties of each?

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